its there in v0 like below
twurl -H ads-api.twitter.com "/0/stats/accounts/abc1/campaigns/1ldet?granularity=DAY&start_time=2013-07-07T07:00:00Z&end_time=2013-07-12T07:00:00Z&metrics=promoted_tweet_timeline_impressions&segmentation_type=GENDER"
use segmentation_type=GENDER

In v1 of the API, segmented analytics are only available through the asynchronous stats endpoint, not the synchronous endpoint. If you’re not able to see segmented analytics through the asynchronous endpoint, could you include a sample request and response that demonstrates this so we can investigate?